I recently bought a 3 year old 8 hp snapper off one of my customers who only used it one season before his knees went out and I started cutting for him. The mower is like new. I bought cheap (400) to resell. I got it home and drained the stale gas out of it. emptied the bowl and blew out the carb. I put fresh gas in it and got it to fire up and run. Today I tried to run it and after about five minutes it cut out on me and would not refire. If I put the choke on it start and run for about 4 seconds and then die. is this just still some remnantts of the stale gas causing this or something else.